Nervous System Spinal Cord 🩺 Flashcards
Cervical nerves
1-8
Cervical enlargement = I put from arms
Thoracic nerves
1-12
Lumber nerves
1-5
Throralolumber enlargement = I put from legs
Sacral nerves
1-5
Fused vertebrae
Coccygeal nerve
Very bottom of sp fused
Horse tail aka
Cauda quina
How many pairs of nerves
31
Function of the Filum terminate externum
To anchor sp to coexist
Dorsal rootlet
Pns to cns
Ventral rootlet
Cns to pns
Spinal nerve
Dorsal + ventral
Meisners corpuscle
Touch
Pacinian corpuscle
Pressure
Dorsal root =
Sensory inputs
Touch and pressure
Peripheral nerve
Myelin 50 m/s = rapid and frequent firing rates
A free nerve ending -
No captual
Pain and temperature
No myelin and speed of 1m/s (slow)= doesn’t fire often
Name for 3and 4
Nucleus proprius
Lateral column =
Motor information
Cuneate fafscicicsli
Arms / white matter
Gracile fascicule =
Legs info
1 and 2 -
Unmylionated = no coloured
Opioids act on areas….
1 and 2 as theses are the areas that receive stimulus of pain and tem
Pain and tem go through …
Tract of lissauer also 3rd passing through the anterior white comminsure spinal segmental level.
Why has the sp have levels of convergence
So that many neutrons can synapse onto one neurone and therefore this allows the sp to remain small
